do an btct 1

N B TNG CT THP 2 LAN ANH

GVHD: THS.CHU TH

N B TNG CT THP I SN SN TON KHIA.

C S THIT K

1. H chu lc chnh cho cng trnh Chn h chu lc chnh cho cng trnh l h khung khng khng gian kt hp vi vch cng ( c s dng ph bin trong thc t ) 2. Chn tiu chun thit k p dng tiu chun thit k cng trnh : TCVN 356-2005 3. Ti liu hng dn Kt cu b tong ct thp tp 1 & 2 V B Tm S tay thc hnh kt cu cng trnh V Mnh Hng Bi ging ca gio vin TS. Chu Th Lan Anh 4. Vt liu s dng B Tng : B Tng B20-

Rb (Mpa) 11.5

Rbt (Mpa) 0.9

Eb (Mpa) 27000

b

1

Ct thp : Loi thp AII RS (Mpa) 280s

1

Es (Mpa) 21000

B. THIT K I. Thit k kt cu sn tng in hnh (lu 1) 1. Chn kich thc tit din cc cu kin a. Dm : Dm chnh : chn bn c nhp ln nht s b tnh ton ( Ln =3400mm) 1 1 1 1 hdc = L1 = 3400 = (170 425)mm chn hdc = 300 (mm) 12 8 12 8 1 1 1 1 bdc = hdc = 300 = (75 150)cm chn bdc = 150 (mm) 4 2 4 2

-

Trong : b. Dm ph

Ln : Dm chnh c nhp ln nht

Vy tit din dm chnh la : 150 300(mm) - Chn kch thc tiet dien dam phu v mi l : 150 200 (mm)SVTH : NGUYN VN QU MSSV : 1001039 M -1-


GVHD: THS.CHU TH

- Chn mi c kch thc tit din : 150 200 (mm) c. Sn - Chiu dy bn sn ph thuc vo ti trng tc dng ln sn . Chiu dy sn c tnh theo cng thc :hs = D L1 m

Trong : Bn k ly m = 40 45 v L1 l cnh ngn ca sn c cnh ngn ln

nht (cnh theo phng chu lc). D = 0,8 1,4 phc thuc vo ti trng.

=> Chn : D = 1 ; L1 = 3,4 (m) = 3400(mm)hs = 1 3400 = 75 85 (mm) , chn hs = 80 (mm) 40 45

S sn , kch thc bn : SN 01 02 03 04 05 06 L1 (m) 1.25 3.4 1.3 1.35 3.2 1.3 L2 (m) 3.8 3.8 2.1 2.425 3.8 1.35

2. Ti trng tc dng ln bn sn a. Tnh ti: Ti trng bn than sn ph thuc vo trng lng cc lp cu to sn : Cc lp cu to sn

Stt

Cc lp cu to sn

Chiu dy lp vt liu : i

i

n pi (H s3

G s ( Tnh ti)

( kN/m )-2-

vt ti)

( kN/m2)

SVTH : NGUYN VN QU MSSV : 1001039 M


GVHD: THS.CHU TH

(m) 1 2 3 4 Gch ceramic Va lt BTCT Va trt 0.01 0.02 0.08 0.015 TNG TI Cng thc : g s = ( ni x i x i ) Tnh ti : gs = 3.133 KN/m2 b. Hot ti : 20 18 25 18 1.2 1.1 1.1 1.1 0.240 0.396 2.200 0.297 3.133

p

s

= n p s ( kN / m 2 ) . Trong : p s c (kN / m 2 ) : hot ti tiu chun .

c

sn S1 S2 S3, S6 S4 S5 TNG

Chc nng Ban cng P.Sinh hot Hnh lang WC P.Ng

p s (kN / m 2 )

c

i(kN / m )3

p (kN / ms

2

)

4 1.5 3 1.5 1.5 14.25

1.2 1.3 1.2 1.3 1.3

4.8 1.95 3.6 1.95 1.95

Tng hp ti trng : Tng ti trng tnh q = (gs + ps) x 1m = (3.133+14.25) x 1 = 17.383 (KN/m) c. Cc hnh thc lin lt sn v bn dm-

-

Khi hd >=3 hs th xem lin kt gia bn v dm l ngm . Khi hd 3 nn sn 8 s ngm vo dm , v ta tnh ton theo bn s 9 Ni lc-3-

hd

30

-

3.

SVTH : NGUYN VN QU MSSV : 1001039


GVHD: THS.CHU TH

a. Phn chia loi sn v cng thc tnh ton2 Ty theo t s = L ca bn m ta tnh theo loi bn k hay bn dm. 1 Trong : + L1 : phng cnh ngn ca bn + L2 : phg cnh di ca bn

L

-

i vi cc bn c t s : 1 < L < 2 th ta tnh theo loi bn k bn cnh c 1 s n hi

L2

-

-

2 T t s = L tra bng ra cc gi tr m i1 , m i 2 , k i1 , k i 2 (tra bng ph lc 15 1 trang 449 sch kt cu b tong ct thp V B Tm tp 2) Ti trng tc dng ln bn : P = q(L1+L2) Trong : q : tng ti trng tc dng ln 1 m2 bn S tnh theo bn k bn cnh

L

Moment dng ln nht nhp : M 1 = m i1 P M 2 = mi 2 P Moment m ln nht trn gi : M I = k i1 P

M II = k i 2 P

Trong :SVTH : NGUYN VN QU MSSV : 1001039 -4-


GVHD: THS.CHU TH

+ M 1 , M 2 : Moment dng nhp theo L1 (phng cnh ngn ) , L2 ( phng cnh di) + M I , M II : Moment m gi theo L1 (phng cnh ngn ) , L2 ( phng cnh di)

BNG TNH NI LC CHO BN K sn S2 S3 S4 S5 S6-

L2 L1

P 66.28 19.58 15.55 62.38 12.59

m 91 0.0196 0.0207 0.0195 0.0203 0.0182

M1 1.30 0.41 0.30 1.27 0.23

m 92 0.0146 0.0089 0.0060 0.0144 0.0176L

M2 0.97 0.17 0.09 0.90 0.22

k 91 0.0454 0.0461 0.0423 0.0467 0.0425

MI 3.01 0.90 0.66 2.91 0.54

k 92 0.0363 0.0197 0.0131 0.0330 0.0408

M II 2.41 0.39 0.2 2.06 0.51

1.12 1.53 1.80 1.19 1.02

2 i vi cc bn c t s = L >= 2 th ta tnh theo loi bn dm (ch lm 1 vic theo phng cnh ngn . Theo phng cnh di ct thp ch t theo cu to nhng khng t hn 20% ct thp theo phng cnh ngn

Cng thc tnh ton :

-

-

l12 : Mment ln nht gi Mg = q 12 l2 M n = q 1 : Moment ln nht nhp 24

BNSVTH : NGUYN VN QU MSSV : 1001039

L2 L1

P-5-

Mg (kN.m2)

Mn kN.m2


GVHD: THS.CHU TH

S1

3.04

7.98

1.13

0.78

4. Tnh thp Ct bn sn c chiu rng b = 1000 (mm) theo phng cnh di L2 tnh ton t ct thp cho bn sn Chn chiu dy lp bo v a = 15 (mm) => ho = 65 (mm) Cc cng thc tnh thp : m =M Rb bho2

R b bh 0 Rs % = [ 0.3 0.9]

,

As =

,

% =

Asc b.ho

,

= 1 1 2 m

-

Bn 1 phng : ban cng ( S1) BNG TNH THP Sn 1 M (kN.m)Mg Mn

m

As (mm2)

Thp chn8@180 6@125

Asc (mm2)

%

0.023 0.016

0.023 0.016

61.4 42.7

279 226

0.43 0.35

-

Bn 2 phng

bn2

3

4

5

M (kN.m) M1 MI M2 M II M1 MI M2 M II M1 MI M2 M II M1 MI M2 M II

Ch s M 1.30 3.01 0.97 2.41 0.41 0.90 0.17 0.39 0.30 0.66 0.09 0.20 1.27 2.91 0.90 2.06

m

As (mm2)

Thp chn6@120 8@180 6@120 8@180 6@120 8@180 6@120 8@180 6@120 8@180 6@120 8@180 6@120 8@180 6@120 8@180

Asc (mm2)

%

0.03 0.06 0.02 0.05 0.01 0.02 0.0035 0.01 0.01 0.01 0.0019 0.0041 0.03 0.06 0.02 0.04

0.03 0.06 0.02 0.05 0.01 0.02 0.0035 0.01 0.01 0.01 0.0019 0.0041 0.03 0.06 0.02 0.04

80.1 160.2 53.4 133.5 26.7 53.4 9.3 26.7 26.7 26.7 5.1 10.9 80.1 160.2 53.4 106.8-6-

236 279 236 279 236 279 236 279 236 279 236 279 236 279 236 279

0.36 0.43 0.36 0.43 0.36 0.43 0.36 0.43 0.36 0.43 0.36 0.43 0.36 0.43 0.36 0.43



GVHD: THS.CHU TH

6

M1 MI M2 M II-

0.23 0.54 0.22 0.51

0.0047 0.01 0.0045 0.01

0.0047 0.01 0.0045 0.01

12.5 26.7 12 26.7

6@120 8@180 6@120 8@180

236 279 236 279

0.36 0.43 0.36 0.43

B tr ct thp : Xem bn v

II. THIT K DM DC TRC B 1. Kch thc s b - Kch thc dm dc trc B s b trn l : 150*300 (mm) 2. Xc nh ti trng v tc ng S TRUYN TI DM TRC B (Xem bn v ) Tnh ti - Trng lng bn thn dm : Vi : + b d ,h d : tit din dm ( m) + h s : chiu dy sn (m) + b : trng lng ring ca b tng (25kN/m3) + n = 1.1 h s tin cy gd = 0.91 (kN/m) - Trng lng tng quy i thnh trng lng phn b u trn dm : gt = n.bt.(ht hd).t (kN/m) Vi : + ht =3.8(m) chiu cao tng nh + hd =0.3 (m) chiu cao ca dm + n = 1.1 h s tin cy + bt = 0.1(m) chiu dy tng + t = 18 (kN/m3) trng lng ring ca tng xy gt = 6.93 (kN/m) - Ti trng sn truyn v dm : + Dng truyn lc hnh tam gic : qs =5 L gs. 1 (kN/m) 2 8 g d =b d ( h d h s ) b n

+ Dng truyn lc hnh thang :


-7-


GVHD: THS.CHU THL1 2

q = (1-22+ 3).gs.

vi = 2L 2

L1

BNG KT QU TRUYN TI Dng truyn ti Hnh tam gic Hnh tam gic Hnh thang Hnh tam gic Hnh thang

SN S1 S2 S3 S5 S6

L1 1.25 3.4 1.3 3.2 1.3

L2 3.8 3.8 2.1 3.8 1.35

gs (kN/m2) 3.133 3.133 3.133 3.133 3.133

0 0 0.31 0 0.48

Gd (kN/m) 1.22 3.33 1.71 3.133 1.32

* Hot ti sn S1 S2 S3 `S5 S6 L1(m) 1.25 3.4 1.3 3.2 1.3 L2(m) 3.8 3.8 2.1 3.8 1.35 Ps 4.8 1.95 3.6 1.95 3.6 Dng truyn ti Hnh tam gic Hnh tam gic Hnh thang Hnh tam gic Hnh thang 0 0 0.31 0 0.48 Ti trn dm Pd (kN/m) 1.875 2.1 2 1.95 1.52

* Ti tp trung : - Consol : + Ti do sn tc dng vo dm mi c dng hnh thang lc phn b trn dm mi v trng lng bn thn dm Ta tnh c lc tp trung . Ti trng do sn S1 truyn vo dm mi c dng hnh thang : q = 1.86 (kN/m). Trng lng bn thn dm : gd = 0.91 (kN/m). Tng ti phn b : q+gd = 2.77 ( kN/m). Ti tp trung vo u dm consol : + Hot ti : ps = 2.85 (kN/m) SVTH : NGUYN VN QU MSSV : 1001039 -8-


GVHD: THS.CHU TH

- Dm ph : Tnh tng t nhng c thm ti phn b ca tng : + Dm ph ngang : Ti do sn S4 truyn vo : q = 1.83 (kN/m) . (hnh thang ) Ti do sn S5 truyn vo : q = 3.6 (kN/m) .(hnh thang) Ti do sn S6 truyn vo : q = 1.27 (kN/m) .(hnh tam gic) Ti do tng trn dm truyn xung : gt = 6.93 (kN/m) Ti trng bn thn dm : gd = 0.91 (kN/m) Tng ti phn b = 1.83+3.6+1.27+6.93+0.91 = 14.54 (kN/m) Ti do dm ph dc truyn vo : Ti tp trung : Hot ti : ( tng t ) y l cch tnh ti tp trung cho dm dc , s truyn ti : sn dm ph dm chnh (ti sn phn b , ti tng , ti trng dm , hot ti ca sn phn b ln dm ). 3. BNG PHN TCH KT QU NI LC STT 1 2 3 Dm (200*300) B1 B2 B3 V tr Gi tri Gia nhp Gi phi Gi tri Gia nhp Gi phi Gi tri Gia nhp Gi phi Mmax (Mmin) (kNm) 0 20.82 -24.21 -24.21 10.64 -17.18 -17.18 12.56 -21.84 Q (kN) -18.69 29.67 -24.29 20.81 -21.79 25.22

4. TNH TON B TR THP * Cc cng thc tnh ct thp tham kho phn sn . Chn a = 40 (mm) ho = 260 (mm) , lp b tng bo v c =25 (mm)

- Bng tnh ct dc : Dm (200*300) V tr Mtt (kNm) As tt (mm2) Thp chn

STT

m

-9-

Asc



GVHD: THS.CHU TH

1

B1

2

B2

3

B3

Gi tri Gia nhp Gi phi Gi tri Gia nhp Gi phi Gi tri Gia nhp Gi phi

0 20.82 24.21 24.21 10.64 17.18 17.18 12.56 21.84

0 0.19 0.21 0.21 0.1 0.15 0.15 0.11 0.19

0 0.21 0.24 0.24 0.11 0.16 0.16 0.12 0.21 336.4 384.4 384.4 176.8 256.3 256.3 192.2 336.4

0.58 0.87 0.97 0.97 0.58 0.87 0.87 0.58 0.87

212 312 114+ 212 114+ 212 212 312 312 212 312

226.2 339.3 380.1 380.1 226.2 339.3 339.3 226.2 339.3

* Tnh Thp ai : iu kin tnh ton : Qmax b3.(1+f).b.Rbt.b.ho Vi : + b3 = 0.6 (b tng nng) + f = 0 ( tit din ch nht ) + Rbt = 0.9 Chn Qmax = 29.67 (kN) Qmax 21.06 (kN) khng tha , khng kh nng chu lc ct . Tnh khong cch ct ai : Stt =( 4Rsw.n.Aw.b2.(1+f).b.Rbt.b.ho2)/Q2 Vi : + + + + Rsw = 225 (MPa) n = 2 (s nhnh thp ai) Aw = 28.3 ( tit din ct ai 6 ) b2 = 2 ( b tng nng)

Stt = 1056.2 (mm2) Smax = 1,5.(1+f).b.Rbt.b.ho2)/Q = 461.4 (mm2) Sct = h/2 v 150 khi hd < 450 (mm) Sct = 150 (mm) S = min{ Stt , Smax , Sct } = 150 (mm) - Kim tra iu kin chu ng sut nn chnh ca bng dm :SVTH : NGUYN VN QU MSSV : 1001039 - 10 -


GVHD: THS.CHU TH

Q 0,3.w1.b1.b.Rb.b.ho Vi : + w1 = 1+ 5w 1,3 = 1.1 (tha) + = Es/Eb + w = n.Aw/bs + b1 = 1- 0,01bRb = 0.885 Q 131 (kN) tha. s BNG KT QU TNH TON V B TR THP AI ST T 1 2 3 L (mm) 3500 2100 4650 Bc chn Su dm Sgia nhp 150 200 150 200 150 200 150 200 150 200 150 200 Khong b tr L/4 L/2 813 1625 813 1625 488 975 488 975 1106 2213 1106 2213

Dm B1 B2 B3

V tr Gi tri Gi phi Gi tri Gi phi Gi tri Gi phi

Q (kN) 18.69 29.67 24.29 20.81 21.79 25.22

III. THIT K CT 1B V 2B . ( nh 1 trt 1 lu ) Ta ch xt trng hp ct nn ng tm , ko xt n trng hp ct chu ti ngang 1, Gi nh s b theo dng truyn ti : Ac = 1.2(Ni)/Rb Vi Ni = qs S (din tch truyn ti) + gt +gd a, Ct trc 1B : Ti trng tc dng : sn S1: + qs1 = gs1 + ps1 = 3.133 + 4.8 = 7.933 (kN/m2). + S1 = 1.25 3.4/2 = 2.125 (m2) sn S2 : + qs2 = gs3+ ps2 = 3.133 + 1.95 = 5.083 (kN/m2). + S2 = 3.8/2 3.4/2 = 3.23 (m2)-

Ti tng : + gt = bt (ht hd )tn(3.8/2 3.4/2) = 24.948 (kN). Ti dm : + gd = nbhd(1.25 + 3.8/2 + 3.4/2) = 6.002 (kN). N = (7.9332.125 + 5.0833.23 + 24.948 + 6.002) = 64.23 (kN).

-

Tng trt : Ac = (1.2 2 N )/Rb = 13405 (mm2). Chn ct c tit din 150150 (mm).SVTH : NGUYN VN QU MSSV : 1001039 - 11 -


GVHD: THS.CHU TH

V Ntrt > Ntng 2 nn ta chn s b tit din ct tng 2 theo tng 1 l : 150150 (mm). b) Ct trc 2B : Ti trng tc dng : sn S2: + qs2 = gs2 + ps2 = 3.133 + 1.95 = 5.083 (kN/m2). + S2 = 3.8/2 3.4/2 = 3.23 (m2)-

sn S2 : + qs3 = gs3+ ps3 = 3.133 + 3.6 = 6.733 (kN/m2). + S2 = 1.375 2.1/2 = 1.444 (m2) Ti tng : + gt = bt (ht hd )tn(3.8/2 3.4/2+ 2.1/2) = 32.225 (kN). Ti dm : + gd = nbhd(2.1/2 + 3.8/2 + 3.4/2) = 5.754 (kN). N = (5.0833.23 + 6.7331.44 4+ 32.225 + 5.754) = 64.12 (kN).

-

-

Tng trt : Ac = (1.2 2 N )/Rb = 13382 (mm2). Chn ct c tit din 150150 (mm). V Ntrt > Ntng 2 nn ta chn s b tit din ct tng 2 theo tng 1 l : 150150 (mm). 2) Tnh ton v b tr ct thp cho ct . a) Ct 1B - Tnh ct thp dc : N = 2 64.23 = 128.46 (kN) L = Ht = 3800 (mm) Lo = 0.7L = 2660 (mm).-

Kim tra mnh : = Lo / b ob = 120 = 17.73 (tha). = 0.8554 As (N/ bRbAb)/Rsc = - 387.7 (mm2) .

Chn thp theo cu to , chn 4 14 c Asc = 615.6 (mm2). Kim tra hl : % = Asc/b.h = 2.74% < max = 3% (tha).

b) Ct 2B Tnh ct thp dc :- 12 -



GVHD: THS.CHU TH

N = 2 64.12 = 128.24 (kN) L = Ht = 3800 (mm) Lo = 0.7L = 2660 (mm).-

Kim tra mnh : = Lo / b ob = 120 = 17.73 (tha). = 0.8554 As (N/ bRbAb)/Rsc = - 389 (mm2) .

Chn thp theo cu to , chn 4 14 c Asc = 615.6 (mm2). Kim tra hl : % = Asc/b.h = 2.74% < max = 3% (tha). Tnh ct ai : Chn ct ai 6 , khong cch : + Vng khng neo thp : @ 15min (dct dc)=1512=180(mm). @ 500 (mm) , @ < 2b=300 (mm) @ 300 (mm). Chn @ =150 (mm) . + Vng neo thp : @ 10d = 120 (mm) , @ 300 (mm) @ 120(mm) Chn @ = 100 (mm). (ko s dng do chiu cao nh thp).

B tr ct thp (Xem bn v) .


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